netdev - Re: [PATCH bpf-next] bpftool: work-around rst2man conversion bug

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Date:   Wed, 18 Dec 2019 23:35:03 +0000
From:   Yonghong Song <yhs@...com>
To:     Andrii Nakryiko <andriin@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        "daniel@...earbox.net" <daniel@...earbox.net>
CC:     "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next] bpftool: work-around rst2man conversion bug



On 12/18/19 2:17 PM, Andrii Nakryiko wrote:
> Work-around what appears to be a bug in rst2man convertion tool, used to
> create man pages out of reStructureText-formatted documents. If text line
> starts with dot, rst2man will put it in resulting man file verbatim. This
> seems to cause man tool to interpret it as a directive/command (e.g., `.bs`), and
> subsequently not render entire line because it's unrecognized one.
> 
> Enclose '.xxx' words in extra formatting to work around.
> 
> Fixes: cb21ac588546 ("bpftool: Add gen subcommand manpage")
> Reported-by: Alexei Starovoitov <ast@...nel.org>
> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
>   tools/bpf/bpftool/Documentation/bpftool-gen.rst | 15 ++++++++-------
>   1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
> index b6a114bf908d..86a87da97d0b 100644
> --- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst
> +++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
> @@ -112,13 +112,14 @@ DESCRIPTION
>   
>   		  If BPF object has global variables, corresponding structs
>   		  with memory layout corresponding to global data data section
> -		  layout will be created. Currently supported ones are: .data,
> -		  .bss, .rodata, and .extern structs/data sections. These
> -		  data sections/structs can be used to set up initial values of
> -		  variables, if set before **example__load**. Afterwards, if
> -		  target kernel supports memory-mapped BPF arrays, same
> -		  structs can be used to fetch and update (non-read-only)
> -		  data from userspace, with same simplicity as for BPF side.
> +		  layout will be created. Currently supported ones are: *.data*,
> +		  *.bss*, *.rodata*, and *.kconfig* structs/data sections.
> +		  These data sections/structs can be used to set up initial
> +		  values of variables, if set before **example__load**.
> +		  Afterwards, if target kernel supports memory-mapped BPF
> +		  arrays, same structs can be used to fetch and update
> +		  (non-read-only) data from userspace, with same simplicity
> +		  as for BPF side.

Still does not look right.

After build, I did `man ./bpftool-gen.8`, and I got the following,

                  sponding to global data data section layout will be 
created. Currently supported ones
                  are: .data, data sections/structs can be used to set 
up initial values of  variables,

.bss, .rodata .kconfig etc. are missing. I am using:

-bash-4.4$ man --version
man 2.6.3

>   
>   	**bpftool gen help**
>   		  Print short help message.
>